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Solving differential equations for Feynman integrals by expansions near singular points
Roman N. Lee, Alexander V. Smirnov, Vladimir A. Smirnov
We describe a strategy to solve differential equations for Feynman integrals by powers series expansions near singular points and to obtain high precision results for the correspon…
Normalized Fuchsian form on Riemann sphere and differential equations for multiloop integrals
Roman N. Lee, Andrei A. Pomeransky
We consider the question of reducibility of the differential system to normalized Fuchsian form on the Riemann sphere. The differential equations for the multiloop integrals in …
The contributions to fermionic four-loop form factors
Roman N. Lee, Alexander V. Smirnov, Vladimir A. Smirnov +1
We compute the four-loop contributions to the photon quark and Higgs quark form factors involving two closed fermion loops. We present analytical results for all non-planar master…